Macro humanize_quantity 

macro_rules! humanize_quantity {
    ($value:expr) => { ... };
}

Format a number of bytes as a human-readable string, using the SI decimal suffixes.

Factors of 1000 (, k, M, G, T, P, E, Z, Y, R, Q) kilo, mega, giga, tera, peta, exa, zetta, yotta, ronna, quetta