[Bug 55029] Wishlist: do reflink on CopyFileW for WINEPREFIX size reduction

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55029

--- Comment #10 from Alex Xu <alex_y_xu(a)yahoo.ca> ---
windows supports CoW in CopyFile now:
https://devblogs.microsoft.com/engineering-at-microsoft/copy-on-write-in-win....
I think previously CopyFile called IOCTL_COPYCHUNK which is still only for
network shares, and now also calls FSCTL_DUPLICATE_EXTENTS_TO_FILE which is
only for ReFS.

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