Like Bas said, it is possible but why would you want to do that?
Either the Data Grid Entity should show be Honda or Toyota.
If you are trying to show some other thing like Owner (CarOwner) of the car, but only want to show the owner's who have a Honda then it should have the CarOwner as the Entity and the XPath should read:
[YourModule.Car_CarOwner/YourModule.Honda]