Sorry about the name confusion - I was not near the server at the time to check the wording (but at lest you found the setting).
It is not at all clear why some people have the issue with dot files disappearing while others (like myself) do not It might be worth toggling this setting, hitting Apply, toggling it back and hitting Apply again just to make sure it is taking effect. Unfortunately as far as I can tell the SMB settings are not included in the Diagnostics so the setting can easily be checked.