some-very-long-name@some-very-long-name:~$ nmblookup some-very-long-
192.168.29.168 some-very-long-<00>
some-very-long-name@some-very-long-name:~$ sudo mount -v //192.168.29.168/some-very-long-name /mnt/ralph12 -o username=some-very-long-name,password=somePassword
mount: //192.168.29.168/some-very-long-name mounted on /mnt/ralph12
some-very-long-name@some-very-long-name:~$

sudo mount -v //some-very-long-/some-very-long-name /mnt/ralph12 -o username=some-very-long-name,password=somePassword

In some cases useful info is found in syslog - try
   dmesg | tail or so.