std::shared_ptr of this

I am currently trying to learn how to use smart pointers. However while doing some experiments I discovered the following situation for which I could not find a satifying solution:

Imagine you have an object of class A being parent of an object of class B (the child), but both should know each other:

class A;
class B;

class A
{
public:
    void addChild(std::shared_ptr<B> child)
    {
        children->push_back(child);

        // How to do pass the pointer correctly?
        // child->setParent(this);  // wrong
        //                  ^^^^
    }

private:        
    std::list<std::shared_ptr<B>> children;
};

class B
{
public:
    setParent(std::shared_ptr<A> parent)
    {
        this->parent = parent;
    };

private:
    std::shared_ptr<A> parent;
};

The question is how can an object of class A pass a std::shared_ptr of itself (this) to its child?

There are solutions for Boost shared pointers (Getting a boost::shared_ptr for this), but how to handle this using the std:: smart pointers?