So there is a Global Zone, and we need to create an FS on a Zone that's in the Global Zone. Also we need the new FS in a new DG/Volume inside the DG of the Zone (if we see it from the Global Zone). How to do it? Using vx. (Or at least an authentic howto needed :D )
You create a file system under Solaris global zone with one of these commands.
You can then use zonecfg to make that file system visible in non global zones.