From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Allison <jra-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
Subject: Re: setting allocation size in cifs/smb3
Date: Tue, 22 Jul 2014 17:07:14 -0700
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On Mon, Jul 21, 2014 at 02:41:58PM -0500, Steve French wrote:
> To Windows 8.1 it appears to round to 4K boundaries when shrinking but
> also not extend the allocation size when allocating beyond end of file
> as the documentation would imply

You can make Samba do the same as Windows by setting:

allocation roundup size

to 4k.