You can calculate this yourself by simply dividing 0.1 arcseconds by 206265 and then multiplying by the distance to the object in question. As an example, at a distance of 4000 miles, you get (0.1/206265)*4000 or 0.00194 miles which equals 10.2 feet. At the distance of Saturn which is 778 million kilometers or 497 million miles, Hubble's resolution limit corresponds to (0.1/206265)*497 million = 241 miles. The number, 206265, by the way is just the number of seconds of arc in one radian. A radian is 57.295 degrees of arc ( 57.295 x 60 x 60 arc seconds )