This file system is based on librefuse and puffs.
The icfs(8) utility can be used to mount an existing directory on a
new mount point. icfs makes use of the virtdir(3) virtual directory
routines. Underneath those virtual directories, the individual
directory entries will be displayed as an exact mirror of the original
directory, except that any capital letters in the original entry's
name will be substituted with an entry name consisting entirely of
lower-case letters.
This is an unusual example of a refuse-based file system which provides
lesser functionality than the file system it sits on.
