Open Santinel 2 archives with Rasterio


I saw that rasterio support reading Santinel 2 archives directly, but I can not find any example. How should I access the bands inside the archive after I read it. 
For example I have:

with"satelite_datasets/"as f:
What should I put instead of "..." to access for example R10 band 4? 

Thank you in advance!

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