linux - Samba 4.2 Shadow Copies in Windows 10 - empty list

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I have a Debian 8 system with Samba
4.2. I'm using ZFS file system for data storage. Windows sharing is working fine, except
Windows clients can't see any Shadow Copies
snapshots.

My samba config
is:

[Test]
comment
            = test
writable = yes
directory mask = 0777
guest ok =
            Yes
path = /samba/123
create mask = 0666
read only =
            No
vfs objects = shadow_copy2

shadow: format =
            auto-%Y-%m-%d_%H.%M.%S--28d
shadow: sort = desc
shadow: snapdir =
            .zfs/snapshot

My
snapshot list is:

zfs list -t
snapshot

NAME
            USED AVAIL REFER MOUNTPOINT
tank/samba/123@GMT-2017.01.06-16.00.00 64K - 96K
            -
tank/samba/123@GMT-2017.01.07-10.00.00 64K - 96K
            -
tank/samba/123@GMT_2017.02.07-14.00.32 64K - 120K
            -
tank/samba/123@GMT_2017.02.07-07.02.04 64K - 120K
            -

I can actually cd
into .zfs/snapshot and see these
snapshots.

I'm trying to check any
errors in log:
journalctl -u smbd -f does not see any errors/warning even with
debug level = 10.
I even checked client-server communications with Wireshark,
and it seems to be OK also:

SMB2
            178 Ioctl Request FSCTL_GET_SHADOW_COPY_DATA File: test1.txt
SMB2 186 Ioctl
            Response FSCTL_GET_SHADOW_COPY_DATA File: test1.txt
            SUCCESS

What else can
I do? Thank you in advance.

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class="normal">Answer

I can't test it to be sure, however I think you shouldn't add the expiration
duration (--28) to the shadow format. Oh, and obviously your format is wrong, you're
mixing up the separators, they don't match those you're using for your snapshots. Set it
up this way:

 shadow: format =
            auto-%Y.%m.%d-%H.%M.%S