config OVERLAY_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