The protocol defined in the URL of your share will tell the MacOS what version of SMB to use.
If you define your path as cifs://YourServerAddress it will use SMB1
if you define your path as smb://YourServerAddress it will use SMB2/3
You may want to use SMB1 if you are experiencing troubles connecting from your MacOS Client to a Cablecast Flex Server running Windows 10.
Article ID: 240
Created On: Mon, Jul 25, 2016 at 8:31 PM
Last Updated On: Mon, Jul 25, 2016 at 8:31 PM
Authored by: Ian Cobb [email@example.com]
Online URL: http://kb.trms.com/article/how-to-define-what-version-of-smb-to-use-when-connecting-to-a-smb-share-from-a-macos-client-240.html