I overfilled my Jeep Grand Cherokee on my first fill up and now I smell gas every time I fill up. I now stop at the click. I am told it is probably my charcoal filter because I keep smelling gas and the mechanics have checked everything twice. Is it safe to drive with that. Does that gas eventually go away?

The charcoal filter is used to filter fumes from the fuel tank. There is a vent line, that comes from your fuel tank to this filter. (Charcoal canister)

Now since the charcoal filter has been completely soaked with gasoline, it will no longer function as it should. Even with vapors from the fuel tank vent line, the canister only has a working 'life' of so far.
You will smell gasoline in strong amounts until it is replaced.

Can't comment whether it is safe or not. (In my thinking, you are driving around with a charcoal canister, that has a charcoal filter soaked with gasoline. I wouldn't use it this way, but that is just my thoughts)