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That's part of it ving, but it also depends on what else (in the distance) you want to be focused in the image. The narrower the aperture (slower f ratio) the greater the depth of field, the greater the distance that will come to focus using the same focus setting.
If it's just the fountain then shutter speed will do it. But if you have someone sitting about 2 meters in front of you and the fountain is 20 meters behind them, then to get both to come to focus in the one shot, you have to decrease the aperture/increase the depth of field, then adjust your shutter speed to "stop" the fountain.
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