Are fractions of satoshis a real thing?

I’m using a crypto accounting service that claims bitcoins are stored on the blockchain with 16 decimal places, and therefore, it’s perfectly reasonable for their reports to include more than the standard 8 digits after the decimal point.

I’ve searched for evidence to support this claim, but so far, I haven’t found any confirmation of 16 decimals. Additionally, no blockchain explorer I’ve checked displays more than the usual 8 decimals.

#asknostr