What is C shared unit? Where can I disable it?

[III-soporte]

When I map all the unit, for example \\x.x.x.x, I can see the SMB/CIFS (ok) but I can see a C unit, in that C I can see, enter and write files all the units that I'm sharing, including a NFS shared folder that "supposly" only have NFS enabled.

What I'm missing?

Thanks,

[StephenB]

C is the full data volume on your NAS.  You are seeing it because you are using the NAS admin credentials to access it. 

Instead, create a NAS user account, and use those credentials.