I'm trying to delete parameters from Revit-family by using Dynamo

What I want to do:
I wanna make Dynamo to delete parameters that are assigned same Built-In-Group automatically.

Now, all parameters can be deleted by following steps.
1.Getting all parameters by “FamilyManager.GetParameters()”
2.Removing parameters one by one by “FamilyManager.RemoveParameter(param)”

I wanna get Group from FamilyParameter-Class for delete-judge.
However, FamilyParameter-Class doesn’t have group as member variable as see http://www.revitapidocs.com/2019/4a9edc57-7ec7-addf-6bff-41d5feeaf43e.htm

How should I do for completing my wish?