I have added /mnt/Scratch/Users/frontrow as a NFS share on ATV 2.0.1 using this command:

sudo nicl . -create /exports/\\/mnt\\/Scratch\\/Users\\/frontrow

and i can add my USB (fat32) drive that nitoTV has mounted with
sudo nicl . -create /exports/\\/mnt\\/Scratch\\/Volumes\\/SHARED

and sudo niutil -list . /exports lists both shares

except when i go to my linux machine and type:
showmount -e appletv it only gives me the one:

any clue? is it possible to share a fat32 USB drive? or is nfs not able to do this?

Thanks again,