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+config OVERLAYFS_FS
+        tristate "Overlay filesystem support"
+        help
+          An overlay filesystem combines two filesystems - an 'upper' filesystem
+          and a 'lower' filesystem.  When a name exists in both filesystems, the
+          object in the 'upper' filesystem is visible while the object in the
+          'lower' filesystem is either hidden or, in the case of directories,
+          merged with the 'upper' object.
+
+          For more information see Documentation/filesystems/overlayfs.txt