pete@piglet/mnt/datastore $ ls -la
total 138
drwxr-xr-x  5 root root    4096 Jul  4 22:05 .
drwxr-xr-x  6 root root    4096 Jul 10 21:39 ..
drwxrwsr-- 13 root mythtv   260 Jul 15 22:55 movies
drwxrwsr-- 31 root photos    32 Jul 15 20:45 photos
drwxrwsr-- 80 root tvshows   82 Jul 16 12:52 TVShows

/etc/group
tvshows:x:1001:pete,mythtv
photos:x:1002:pete,mythtv
mythtv:x:1003:pete,mythtv