My config files are on 644, directories on 755, owner:group is openhab:openhab.
With the following smb.conf I am able to edit the files without any problems from my windows desktop:
[openhab_config]
path = /etc/openhab
available = yes
read only = no
browseable = yes
public = no
writeable = yes
force user = openhab
force group = openhab
create mask =0777
directory mask=0777
guest ok = no
I’m not a samba specialist, so maybe I have not the best security setup with this smb.conf, but it works 