You've probably seen enough long exposure water shots. However, I shot these at 3pm in open shade - the result of employing a -10 stop B+W neutral density (ND) filter. Unfortunately, yours truly forgot a tripod release plate, so I had to wrestle with a flimsy plastic gorilla pod to get a few sharp frames from a 13 second shutter speed. The ND will usually prevent the camera's auto focus from locking on the subject but the X-Pro1 brightened the scene to get a lock and then I placed it into manual focus before messing with the "tripod."
Initial exposure was determined and then ten stops were subtracted by decreasing shutter speed and adjusting f-stop to keep the lens in it's happy (sharp) place. The top image is interesting because with this filter, the highlights in the water didn't blow out and the shadows retained enough detail. In post, I increased mid-tone contrast and then added a slight s-curve.