Is there any truth to this statement?

"VNX5300 needs SMB 1.0 enabled on the DC or kerberos fails between the VNX and the DC to authenticate all user access to the CIFS shares."

If I'm on code levels: Block-05.32.000.5.219 and File-7.1.79-8, does it use SMBv3 by default?

The output of command "server_cifs server_2" shows Max protocol = SMB3.0.