FltCreateFile with IO_IGNORE_SHARE_ACCESS_CHECK Flag

NTFSD
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Hi all
I used the function FltCreateFile with IO_IGNORE_SHARE_ACCESS_CHECK
flag at pre-cleanup to open the file which was already open and
the ShareAccess Flags of that file is 0. it works in FAT32, but not NTFS.

I also tested that at Post-Create and it works well at that time even
though in NTFS.
why didn’t this flag,IO_IGNORE_SHARE_ACCESS_CHECK work in NTFS at precleanup?

if I understood wrong about this FLAGs. what shoud I do if I want to
open the opened file ?