SAMBA4 configuration that enable shared document. However, for newer Windows 10, Anonymous access must be enabled from Registry.
# Global parameters
[global]
client max protocol = SMB3
client min protocol = SMB2
dns proxy = No
log file = /var/log/samba/log.%m
map to guest = Bad User
max log size = 1000
ntlm auth = ntlmv1-permitted
panic action = /usr/share/samba/panic-action %d
server min protocol = SMB2
server role = standalone server
server string = %h server (Samba, Ubuntu)
unix extensions = No
usershare allow guests = Yes
idmap config * : backend = tdb
wide links = Yes
[shares]
create mask = 0664
directory mask = 0775
guest ok = Yes
guest only = Yes
path = /shares
read only = No
valid users = nobody