format to the `-l` option to `ls`(1).
-x, \--xdev, \--one-file-system
-: don't cross filesystem boundaries when recursing
- through the filesystem. Only applicable if you're
- using `-u`.
+: don't cross filesystem boundaries when recursing through the
+ filesystem -- though as with tar and rsync, the mount points
+ themselves will still be indexed. Only applicable if you're using
+ `-u`.
\--fake-valid
: mark specified filenames as up-to-date even if they