It’s not uncommon to see some small pits on the surface of the granite slabs. These pits are formed during the polishing process, when some of the weaker components of granite, like Biotite, flake off from the surface. This happens at the granite processing plants in different countries where the granite is quarried and polished.
The pits themselves do not make the granite less durable or inferior for use in countertops, but the look and feel of the granite with the pits may bother some clients. It is a better if you discuss these issues with the fabricators before you make the final decision on your stone selection.
We do not recommend that you have the pits filled because no compound can adequately or permanently fill these spaces without visually affecting the surface of the stone. The best practice is to discuss imperfections with your fabricator before selecting the stone, and if you really hate the pits you should consider a granite that has no visual imperfections.