why path::root_name() has different behavior with and

Question

For last couple of days I have been experimenting the behavior of few of the functions of filesystem and experimental/filesystem library.

Note: I ran the code on https://godbolt.org/

below is the code snippet with its output

1. experimental/filesystem

#include <iostream>
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;

int main()
{
auto  p = fs::path("//net");
std::cout<<"p = " << p
         <<"\np.root_name= "<< p.root_name()
         <<"\nand p.root_Dir= "<< p.root_directory()
         <<"\np.is_absolute= "<<p.is_absolute()<<std::endl;
}

output:

p = "//net"    
p.root_name= "//net"    
and p.root_Dir= ""    
p.is_absolute= 0

2. filesystem

#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
 
int main()
{
auto  p = fs::path("//net");
std::cout<<"p = " << p
         <<"\np.root_name= "<< p.root_name()
         <<"\nand p.root_Dir= "<< p.root_directory()
         <<"\np.is_absolute= "<<p.is_absolute()<<std::endl;
}

output:

p = "//net"
p.root_name= ""
and p.root_Dir= "/"
p.is_absolute= 1

Is there any way to look into the implementation of these functions ?