Transport from Fontainebleau to Charles de Gaulle Airport

Our holiday in France will finish in Dijon. We are reluctant to drive all the way to CDG airport, so would like to leave the car at Fontainebleau where I believe there is a Hertz office. Does anyone know if there is a group shuttle service from Fontainebleau to CDG Airport? Or is there a better town outside Paris to leave the car?

I have heard of a company called Departure, but not sure if it only offers a private service or if it even operates from Fontainebleau?

Would welcome suggestions.