Provided by: rofs_2006.11.28-2ubuntu2_amd64 

NAME
ROFS - Mounts directories as read-only
DESCRIPTION
usage: rofs readwritepath mountpoint [options]
Mounts readwritepath as a read-only mount at mountpoint
general options:
-o opt,[opt...]
mount options
-h --help
print help
-V --version
print version
ROFS version 2006.11.28 May 2013 ROFS(1)