samba 4.11 or newer version enable SMB1

From 4.11 or newer version,Samba does not support smb1 protocal by default.

https://wiki.samba.org/index.php/Samba_4.11_Features_added/changed#LanMan_and_plaintext_authentication_deprecated

But there are few devices in my home only support smb1 :(

so we can put these parameter into [global] section in /etc/samba/smb.conf to solve this issue:

client min protocol = NT1
server min protocol = NT1
lanman auth = yes
encrypt passwords = yes