user47658: I know that I can't send even 1 satoshi due to dust transaction prevention, but the question is - might the transaction fee be not e.g. 160 satoshis, but 160.1 satoshis? 

user3041: No, it's not possible. Transaction fees are not explicitly included in transactions: they are computed from the difference between the sum of the amounts of the outputs and the sum of the amount of the inputs [1]. Since the smallest value that can be represented in an output amount is a satoshi [2], it's not possible to generate fees less than that.
[1] http://chimera.labs.oreilly.com/books/1234000001802/ch05.html#tx_fees
[2] http://chimera.labs.oreilly.com/books/1234000001802/ch02.html#cup_of_coffee

47658: <p>I know that I can't send even 1 satoshi due to dust transaction prevention, but the question is - might the transaction fee be not e.g. 160 satoshis, but 160.1 satoshis? </p>
 3041: <p>No, it's not possible. Transaction fees are not explicitly included in transactions: they are computed from the difference between the sum of the amounts of the outputs and the sum of the amount of the inputs [1]. Since the smallest value that can be represented in an output amount is a satoshi [2], it's not possible to generate fees less than that.</p>

<p>[1] <a href="http://chimera.labs.oreilly.com/books/1234000001802/ch05.html#tx_fees" rel="nofollow noreferrer">http://chimera.labs.oreilly.com/books/1234000001802/ch05.html#tx_fees</a></p>

<p>[2] <a href="http://chimera.labs.oreilly.com/books/1234000001802/ch02.html#cup_of_coffee" rel="nofollow noreferrer">http://chimera.labs.oreilly.com/books/1234000001802/ch02.html#cup_of_coffee</a></p>
