User`s manual

RNAS-1200 Series Setting Up Network Shares
12-7
Deleting a Mapped Folder on Ubuntu Linux
If you are using Linux Ubuntu, see this step:
Right-click the DIRECTORY_NAME on IP addrerss in Network list, and then select umount to disconnect.
If you are comfortable using the Linux Console, you may use the umount command to unmount a shared
Samba directory.