iptables MAC Address Filtering

is it possible to filter mac address using iptables with the this scenario? I have an ssh server what I want is to filter the MAC addresses of people who can connect. But these computers are not in the LAN. They are connecting behind a router. How do I filter them?
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If they are behind the router, the packet received by the server won't have the client's MAC but the router's MAC; so you cannot distinguish people behind the router by the MAC address.

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thogzy hi.
The answer given by lbertacco  is correct.
If you are hesitating about accepting his answer, I agree with him, there may not be other correct answer.

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