date: implement --resolution #6143
Description
This sounds like a feature that people probably use:
$ date --resolution
0.000000001
$ cargo run date --resolution
error: unexpected argument '--resolution' found
tip: a similar argument exists: '--version'
Usage: target/debug/coreutils date [OPTION]... [+FORMAT]...
target/debug/coreutils date [OPTION]... [MMDDhhmm[[CC]YY][.ss]]
For more information, try '--help'.
[$? = 1]When you implement it, please make sure that you set overrides_with, so that date --resolution --resolution also works :)
Found while working on #6142