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set via NFSV3SATTRTIME_TOSERVER and not NFSV3SATTRTIME_TOCLIENT, add VA_UTIMES_NULL to the va_vflags. This reflects our policy where we're much more liberal about who can set a & m times to 'now' than we are about who can set them to a specific time. Should close PR 15597 from Martin Husemann. Patch is based on the one Matthias Drochner gave in the PR.