MNT_ATIME_MASK
((fl & MNT_ATIME_MASK) != (mnt_flags & MNT_ATIME_MASK)))
mnt_flags &= ~MNT_ATIME_MASK;
mnt_flags |= path->mnt->mnt_flags & MNT_ATIME_MASK;
((mnt_flags & MNT_ATIME_MASK) != (new_flags & MNT_ATIME_MASK)))