[Samba] How to know which protocol version clients use?

[Heiner Billich]

Hello,

I currently run samba with

    server min protocol = NT1

but I need to move towards

    server min protocol = SMB2

is there any way I can detect which clients still use the older protocol 
versions? I would like to estimate the impact of the change before i do 
close NT1/SMB1.

Thank and kind regards,

Heiner Billich