You can check the version of the SMB protocol by which the client connects to the server using the PowerShell command:
Get-SmbConnection
On the file server side, you can display a list of the versions of the SMB protocols that the clients are currently using. Run the command:
Get-SmbSession | Select-Object -ExpandProperty Dialect | Sort-Object -Unique
In this example, there are 898 clients connected to the server using SMB 2.1 (Windows 7/ 2008 R2) and 8 clients via SMB 3.02 (Windows 8.1 / 2012 R2).
