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I've had a few shares configured in Samba 4.9.3 (Arch Linux), everything was fine. Access control was done via unix accounts and groups. Then I decided to change the running system.

I set up a Time Machine backup volume in Samba, introducing the vfs_fruit module. That part seems to have started the problems. Sources said that macOS can be picky and the module chain catia fruit streams_xattr needs to be enabled on all the shares, not just the Time Machine share. So I did that.

(The Time Machine backup went through with those settings. TBH I didn't try restoring yet and I'm a little scared of it.)

However, whenever I create a folder on a normal share (via Finder.app), it now gets unix permissions drwxr-xr-x+ that differ from the directory mask = 2770 that I configured for the share. Apart from that, it has these ACLs set:

> getfacl /mnt/dungeon/tmp/untitled folder

getfacl: Removing leading '/' from absolute path names

# file: mnt/dungeon/tmp/untitled folder

# owner: nobody

# group: smb_tmp

user::rwx

user:nobody:rwx         #effective:r-x

group::rwx          #effective:r-x

group:smb_tmp:rwx       #effective:r-x

mask::r-x

other::r-x

default:user::rwx

default:user:nobody:rwx

default:group::rwx

default:group:smb_tmp:rwx

default:mask::rwx

default:other::---

The mask::r-x part seems to prevent my user (in group smb_tmp) from even renaming the "untitled folder" I created. If I set mask to rwx manually like this, the folder becomes editable:

sudo setfacl -m mask::rwx /mnt/dungeon/tmp/untitled folder

Changing the folder's permissions from Finder.app is not possible, it tells me I don't have the necessary permission.

If I create a folder in the same location from a Windows 8 client, it has the proper unix access rights and no ACLs set.

I also tried modifying my user's umask on the server, but changing that from the default 022 to 027 didn't change anything.

The other Samba options I tried are in the global section of my smb.conf. None of them changed the ACLs of the folders I created.

What do I need to do to have both Time Machine backup and group-owned shares work properly?
I'm not particularly afraid of ACLs, but if I can get by without them that'd be just fine.

Try setting the following global option:

fruit:nfs_aces = no

From the manpage of vfs_fruit:

fruit:nfs_aces = yes | no

A global option whether support for querying and modifying the UNIX mode of directory entries via NFS ACEs is enabled, default yes.