partial template specialization for all derived cl*****

Hi,

I just learned and played around a bit with partial template 
specialization, e.g. specializing for all pointers:

#include <iostream>
template<typename T> class MyClass {
   public:
     void someMember() {
         std::cout << "No pointer.\n";
     }
};
template<typename T> class MyClass<T *> {
   public:
     void someMember() {
         std::cout << "Pointer.\n";
     }
};
int main(void) {
     MyClass<int *> pointer1;
     MyClass<char *> pointer2;
     MyClass<int> noPointer;
     pointer1.someMember();
     pointer2.someMember();
     noPointer.someMember();
}

But what I really need is a partial specialization for a specific base 
class and all its derived cl*****, i.e. something like:

#include <iostream>
class Base {};
class Derived: public Base {};
class Any {};
template<typename T> class MyClass {
   public:
     void someMember() {
         std::cout << "Anything else.\n";
     }
};
template<typename T> class MyClass<T: public Base> { // fantasy syntax
   public:
     void someMember() {
         std::cout << "Class Base or any derived class of Base.\n";
     }
};
int main(void) {
     MyClass<Base> base;
     MyClass<Derived> derived;
     MyClass<Any> any;
     base.someMember();
     derived.someMember();
     any.someMember();
}

Is there any way to achieve something like this?

Thanks for any help,

Christof