This fixes some minor interop. nits (group owners of files, for example) but also allows the Windows privilege model to be integrated as a first class citizen in the OS, and most importantly, allows for SIDs to be stored natively as the user's in-kernel credentials, which is a real boon for identity management/mapping across protocols, and for group policy (e.g. local groups). As a bonus, this allows any userspace CIFS processes to run without escalated privilege (e.g. switching to root for take ownership) which can be seen as a security risk.
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