MNT_NOCOVER
#define MOPT_NOCOVER { "cover", 1, MNT_NOCOVER, 0 }
if (flags & MNT_NOCOVER) res = catopt(res, "nocover");
fsflags |= MNT_NOCOVER;
(fsflags & MNT_NOCOVER) != 0) {
fsflags |= MNT_NOCOVER;
fsflags &= ~MNT_NOCOVER;
{ MNT_NOCOVER, "nocover" }, \
MNT_BYFSID | MNT_NOCOVER | MNT_EMPTYDIR | \