How to make namespace in lua?

I want to bind static class function to lua. As you know, static class function is something difference with class function. So function call code in lua should be like this...

//C++
lua_tinker::def(L, "Foo_Func", &Foo::Func);

//Lua
Foo_Func()

But I want to call function in lua like this

//Lua
Foo.Func()

Is there any way to use like that? Lua table might be helpful. But I cannot find any references.