How to properly distribute the rights to the folder and files in samba for windows users?

Question

linux

On samba, a ball was made for three users who access it from under windows.
In the samba settings, the valid users = @filegroup
user1 group is specified , user2 and user3 are included in this group.
But the problem is that when changing files, for example, user1 resaves the files and they become with the rights user1:user1group .
How can I ensure that group permissions do not change when updating files?

Answer 1

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create mask = 777
not as you wanted... but it should work )