Well micro is still a thousand times better then milis!
Indeed !
However, the last git version doesn't provide the micro.
A possible solution, in order to keep the S of SFML, and deliver the exact nanosecond time : provide 2 functions.
GetElapsedTime() / GetFrameTime(); // In float (second), easy to manipulate. (Sprite.Move(ElapedTime * 20, 0) for example).
GetPreciseElapsedTime() / GetPreciseFrameTime(); // In nanosecond.
So, everybody is happy