@zingaro That’s not NFS, in the command it says cifs. without heavy init modification, fog will not work with cifs. Also, you shouldn’t setup an NFS share this way, either. The share does not get mounted to the server at all, because if it were, imaging would not work. The Linux kernel will not allow you to re-export an already exported directory. You don’t even need to touch the CLI of the main server to do this. Just the NAS and the web interface of FOG.
On the NAS, create an NFS share with full read/write permissions for everyone. Create an FTP user called fog and grant it full rights to the share. In the share, make a file called .mntcheck and a folder called dev and inside of dev make another file called .mntcheck Then plug in the IP address and share name and the fog user along with it’s password, and ftp path into FOG’s web interface.