Here’s how to turn on Samba encryption on a share.
Edit /etc/samba/smb.conf on the Samba server.
[global]
server max protocol = SMB3
smb encrypt = required
lanman auth = no
Edit /etc/samba/smb.conf on the Samba clients.
[global]
smb encrypt = required
client min protocol = SMB2
client max protocol = SMB3
To connect.
smbclient -e -m SMB3 //xxx.xxx.xxx.xxx/share-name -U username