diff --git a/apps/files_trashbin/lib/Trash/TrashItem.php b/apps/files_trashbin/lib/Trash/TrashItem.php
index 40ceb59aba..a0a0e1f67c 100644
--- a/apps/files_trashbin/lib/Trash/TrashItem.php
+++ b/apps/files_trashbin/lib/Trash/TrashItem.php
@@ -82,8 +82,8 @@ class TrashItem implements ITrashItem {
 		return $this->fileInfo->getEtag();
 	}
 
-	public function getSize() {
-		return $this->fileInfo->getSize();
+	public function getSize($includeMounts = true) {
+		return $this->fileInfo->getSize($includeMounts);
 	}
 
 	public function getMtime() {
@@ -133,7 +133,7 @@ class TrashItem implements ITrashItem {
 	public function isReadable() {
 		return $this->fileInfo->isReadable();
 	}
-	
+
 	public function isUpdateable() {
 		return $this->fileInfo->isUpdateable();
 	}
diff --git a/lib/private/Files/FileInfo.php b/lib/private/Files/FileInfo.php
index 575af56ceb..19b95cd035 100644
--- a/lib/private/Files/FileInfo.php
+++ b/lib/private/Files/FileInfo.php
@@ -80,6 +80,13 @@ class FileInfo implements \OCP\Files\FileInfo, \ArrayAccess {
 
 	private $subMountsUsed = false;
 
+	/**
+	 * The size of the file/folder without any sub mount
+	 *
+	 * @var int
+	 */
+	private $rawSize = 0;
+
 	/**
 	 * @param string|boolean $path
 	 * @param Storage\Storage $storage
@@ -95,6 +102,7 @@ class FileInfo implements \OCP\Files\FileInfo, \ArrayAccess {
 		$this->data = $data;
 		$this->mount = $mount;
 		$this->owner = $owner;
+		$this->rawSize = $this->data['size'] ?? 0;
 	}
 
 	public function offsetSet($offset, $value) {
@@ -194,9 +202,13 @@ class FileInfo implements \OCP\Files\FileInfo, \ArrayAccess {
 	/**
 	 * @return int
 	 */
-	public function getSize() {
-		$this->updateEntryfromSubMounts();
-		return isset($this->data['size']) ? 0 + $this->data['size'] : 0;
+	public function getSize($includeMounts = true) {
+		if ($includeMounts) {
+			$this->updateEntryfromSubMounts();
+			return isset($this->data['size']) ? 0 + $this->data['size'] : 0;
+		} else {
+			return $this->rawSize;
+		}
 	}
 
 	/**
diff --git a/lib/private/Files/Node/LazyRoot.php b/lib/private/Files/Node/LazyRoot.php
index 389a1a9f0f..01b4ca5276 100644
--- a/lib/private/Files/Node/LazyRoot.php
+++ b/lib/private/Files/Node/LazyRoot.php
@@ -214,7 +214,7 @@ class LazyRoot implements IRootFolder {
 	/**
 	 * @inheritDoc
 	 */
-	public function getSize() {
+	public function getSize($includeMounts = true) {
 		return $this->__call(__FUNCTION__, func_get_args());
 	}
 
diff --git a/lib/private/Files/Node/Node.php b/lib/private/Files/Node/Node.php
index 590f108061..41e8bf7524 100644
--- a/lib/private/Files/Node/Node.php
+++ b/lib/private/Files/Node/Node.php
@@ -190,12 +190,13 @@ class Node implements \OCP\Files\Node {
 	}
 
 	/**
+	 * @param bool $includeMounts
 	 * @return int
 	 * @throws InvalidPathException
 	 * @throws NotFoundException
 	 */
-	public function getSize() {
-		return $this->getFileInfo()->getSize();
+	public function getSize($includeMounts = true) {
+		return $this->getFileInfo()->getSize($includeMounts);
 	}
 
 	/**
diff --git a/lib/private/Files/Node/NonExistingFile.php b/lib/private/Files/Node/NonExistingFile.php
index fbfb67749b..5183102483 100644
--- a/lib/private/Files/Node/NonExistingFile.php
+++ b/lib/private/Files/Node/NonExistingFile.php
@@ -66,9 +66,9 @@ class NonExistingFile extends File {
 		}
 	}
 
-	public function getSize() {
+	public function getSize($includeMounts = true) {
 		if ($this->fileInfo) {
-			return parent::getSize();
+			return parent::getSize($includeMounts);
 		} else {
 			throw new NotFoundException();
 		}
diff --git a/lib/private/Files/Node/NonExistingFolder.php b/lib/private/Files/Node/NonExistingFolder.php
index efc359181c..f6a1794a53 100644
--- a/lib/private/Files/Node/NonExistingFolder.php
+++ b/lib/private/Files/Node/NonExistingFolder.php
@@ -67,9 +67,9 @@ class NonExistingFolder extends Folder {
 		}
 	}
 
-	public function getSize() {
+	public function getSize($includeMounts = true) {
 		if ($this->fileInfo) {
-			return parent::getSize();
+			return parent::getSize($includeMounts);
 		} else {
 			throw new NotFoundException();
 		}
diff --git a/lib/private/Files/Node/Root.php b/lib/private/Files/Node/Root.php
index 189c2863a3..390d29edb3 100644
--- a/lib/private/Files/Node/Root.php
+++ b/lib/private/Files/Node/Root.php
@@ -282,9 +282,10 @@ class Root extends Folder implements IRootFolder {
 	}
 
 	/**
+	 * @param bool $includeMounts
 	 * @return int
 	 */
-	public function getSize() {
+	public function getSize($includeMounts = true) {
 		return null;
 	}
 
diff --git a/lib/public/Files/FileInfo.php b/lib/public/Files/FileInfo.php
index e25a47e83c..c256f0980f 100644
--- a/lib/public/Files/FileInfo.php
+++ b/lib/public/Files/FileInfo.php
@@ -81,10 +81,11 @@ interface FileInfo {
 	/**
 	 * Get the size in bytes for the file or folder
 	 *
+	 * @param bool $includeMounts whether or not to include the size of any sub mounts, since 16.0.0
 	 * @return int
 	 * @since 7.0.0
 	 */
-	public function getSize();
+	public function getSize($includeMounts = true);
 
 	/**
 	 * Get the last modified date as timestamp for the file or folder
diff --git a/lib/public/Files/Node.php b/lib/public/Files/Node.php
index 59bd0e193c..016b217afc 100644
--- a/lib/public/Files/Node.php
+++ b/lib/public/Files/Node.php
@@ -136,12 +136,13 @@ interface Node extends FileInfo {
 	/**
 	 * Get the size of the file or folder in bytes
 	 *
+	 * @param bool $includeMounts
 	 * @return int
 	 * @throws InvalidPathException
 	 * @throws NotFoundException
 	 * @since 6.0.0
 	 */
-	public function getSize();
+	public function getSize($includeMounts = true);
 
 	/**
 	 * Get the Etag of the file or folder