I know your question is a bit old but check this out:
guthrie> vfiler run dylan cifs sessions -
===== dylan
Usage:
cifs sessions [-p smb|smb2] [-i ipv4|ipv6] [-s | -c] [ <user_name> | <workstation_name> | <IP_address> | * ]
cifs sessions [-t] [-c]
Give "cifs sessions" an invalid argument (the dash in the above example) and it prints the usage.
Try them all. In particular, I think the "-t" might give you what you are looking for. The "-c" also works ok.
Cheers, Renton.