try these
mount -t cifs //<IP address of NAS box 192.168.x.y>/<shared folder> /<mount point> -o user=<user on NAS>,pass=<passwd on NAS>,domain=<domain>
mount.cifs //<IP address of NAS box 192.168.x.y>/<shared folder> /<mount point> -o user=<user on NAS>,pass=<passwd on NAS>,domain=<domain>