https://bugs.winehq.org/show_bug.cgi?id=50281
--- Comment #7 from Shmerl shtetldik@gmail.com --- (In reply to Zebediah Figura from comment #6)
Yes, it is still the case. The lack of a kernel interface is (was) not the only reason why fsync will not be included.
And what about Wine staging? So all that effort by Collabora in the end didn't end up being successful? I always thought it was intended for Wine.