Yes but the shadow drops on the ground, the shading quality of  a shadow is determined by the shadingrate settings of the object it drops on. You can set the shadingrate in the rendersettings to 0.05 but if drops on an object with a higher setting of 0.2 it will take the higher settings: just try it out: set your shadingrate in your rendersettings to 0.1, and leave the  groundobject as it is and then do a render with the shadingrate of your groundobject to 0.1 and render again.

best regards,

Bopper.

-How can you improve things when you don't make mistakes?