Constant ONE_THIRD_DUST_THRESHOLD_RATE 

pub const ONE_THIRD_DUST_THRESHOLD_RATE: u32 = 100;

The rate used to calculate the dust threshold, in zatoshis per 1000 bytes.

History: https://github.com/zcash/zcash/blob/v6.10.0/src/policy/policy.h#L43-L89