Patch to add support for advertising FULLSYNC to Mac OSX Clients

[Jeremy Allison]

On Fri, Apr 07, 2017 at 10:51:21PM +0200, Ralph Böhme wrote:
> > Allowing clients to force sync like this can *kill* any
> > asyncio performance from us.
> 
> Yup. But I bet the macOS SMB server implements this sync and if we implement it
> async and send an interim response the client will explode.

Now that I can completely believe :-).