The steps of granularity would likely be the Planck length. His proposal does have some unresolved issues. E.g. distance is quantized but the interactions of t

The steps of granularity would likely be the Planck length. His proposal does have some unresolved issues. E.g. distance is quantized but the interactions of those quantized variables produce continuous things that affect other things that are quantized. We don't have enough energy to see the limit yet, but it is possible.