Okay, I tested and it is SMB2
Server: Win 10 Pro
Client Kodi Protocol
Android (4.4.2) 16.1 SMB1
LibreELEC 16.1 SMB1
Win 10 16.1 SMB2This all using default/vanilla settings, just add the shares in Kodi 'add source'.
The "server" is you Windows 10 that's the samba versión thats mater. Kodi is just a client like Libreelec.