root@kali:~# nmap --script smb-enum-shares -p445  <IP>

Starting Nmap 7.31 ( https://nmap.org ) at 2017-01-18 10:15 CET
Nmap scan report for <IP>
Host is up (0.00038s latency).
PORT    STATE SERVICE
445/tcp open  microsoft-ds
MAC Address: 08:00:27:01:6B:81 (Oracle VirtualBox virtual NIC)

Host script results:
| smb-enum-shares:
|   account_used: guest
|   IPC$:
|     Type: STYPE_IPC_HIDDEN
|     Comment: IPC Service (Kioptrix4 server (Samba, Ubuntu))
|     Users: 1
|     Max Users: <unlimited>
|     Path: C:tmp
|     Anonymous access: READ/WRITE
|     Current user access: READ/WRITE
|   print$:
|     Type: STYPE_DISKTREE
|     Comment: Printer Drivers
|     Users: 0
|     Max Users: <unlimited>
|     Path: C:varlibsambaprinters
|     Anonymous access: <none>
|_    Current user access: <none>

Nmap done: 1 IP address (1 host up) scanned in 6.99 seconds

mount -t cifs -o user=guest //<IP>/tmp /mnt/
mount -t cifs -o user=guest //<IP>/C:tmp /mnt/

WARNING: The "syslog" option is deprecated
Enter guest's password:
Domain=[WORKGROUP] OS=[Unix] Server=[Samba 3.0.28a]
tree connect failed: NT_STATUS_BAD_NETWORK_NAME