How small can voxels be?

I'm curious to know, just how small can voxels actually be in the realm of digital representation and cryptocurrency? Are there any limitations to their minuteness, or is it theoretically possible for them to shrink to infinitesimal sizes? And if so, what implications might this have on the precision and efficiency of transactions within the blockchain ecosystem? It's a fascinating concept to ponder, and I'm eager to hear your insights on the matter.