The way Hotspots work that - usually - cannot be done on the router. Hotspots run on a network gateway interface. Traffic between clients never flows through the router, so the router cannot block it. This is a feature you'd implement at the switch or AP level.
You _could_ make a whole lot of /30 networks, bridge them, run the Hotspot on the bridge and use the bridge or IP firewall (applied to the bridge) to block traffic between clients. But that doesn't scale well at all and is pretty much just a theoretical possibility.
thanks for your response, i have my another option is to use the client isolation in my AP im using ubi nanostation act as wifi access here in resort.
salamat fewi