NFSMNT_MIRRORMOUNT
esi->esi_mount_flags = NFSMNT_MIRRORMOUNT;
if (mi->mi_flags & MI4_PUBLIC && nargs->flags & NFSMNT_MIRRORMOUNT)
if (flags & NFSMNT_MIRRORMOUNT)
#define NFSMNT_EPHEMERAL (NFSMNT_MIRRORMOUNT | NFSMNT_REFERRAL)