Can you use a Yongnuo yn-568ex on a Nikon d70s?

I wanted to know if this flash supports HIGH SPEED SYNC on this camera? I like shooting family portraits outside but hate the look without fill in flash. Anybody know?

Added (1). By the way, the flash DOES support high speed sync. I just need to know if the camera can use the function and go up to the 1/8000

I think you will get better results waiting for cloudy weather to shoot your portraits.
I don't know whether the Yongnuo yn-568ex has compatibility with that feature. I have found in my own experiments with my D90 and SB600 flash that flash in the FP mode is not very strong, so I don't think it will provide much useful fill if it works that way at all.