Somebody I know recently had troubles with his NAS and needed to turn in the NAS device but wanted to recover his data. According to the information he was able to gather it was an XFS file system.
He had little to no linux knowledge but to recover he made a Ubuntu machine and asked my help to mount his drive. I didn't have any previous experience with XFS so here is how we did it:
The device showed up in the system as sdb3.
1. sudo mkdir /media/nadisk
2. sudo mount -o inode64 -t xfs /dev/sdb3 /media/nadisk
After this he was able to get his data back and bring his NAS device back to the store :)