$ sudo sshfs marc@192.168.1.200:/home/marc -o allow_other /media/homeserver/home/marc
Password:
$ df -h /media/homeserver/home/marc/
Filesystem Size Used Avail Use% Mounted on
sshfs#marc@192.168.1.200:/home/marc
7.5T 0 7.5T 0% /media/homeserver/home/marc
$
Yeah, sshfs is weird like that, it reports a huge amount of available space (7629.39 GB, to be exact). I hope this is fixed in a future release :)
Apparently the SFTP protocol does not support disk statistics, so df reports a nonsense value. Zero would make a little more sense, but might trigger “Disk full!” errors in overly smart GUIs.