mount_mfs(8) on FreeBSD
The text 246bc8b4dadc, as FreeBSD 10.1-RELEASE shipped it.
configure and mount an in-memory file system using the md(4) driver
Flags it lists
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-D -
-E -
-F -
-L -
-M -
-N -
-O -
-P -
-S -
-U -
-X -
-a -
-b -
-c -
-d -
-e -
-f -
-i -
-l -
-m -
-n -
-o -
-p -
-s -
-t -
-v -
-w