Programmatically assess relationship between type variables in class hierarchy

Suppose I have a Java class hierarchy defined as follow:

interface Bar<T> {}

class Foo<A,B> implements Bar<B> {}

How can I programmatically assess (using reflection) that the type parameter of Bar in Foo is the second of foo's parameters and not the first (B instead of A)?

I've tried using TypeVariable#getName() in order to compare the names, but when I apply getGenericInterfaces() to Foo<A,B> I get Bar<T> and not Bar<B>