Added nanosecond time elements

[joachimmetz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.24390% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 96.56%. Comparing base (0ec1ef3) to head (b0e4bb7).

Files	Patch %	Lines
dfdatetime/time_elements.py	90.24%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #284      +/-   ##
==========================================
- Coverage   96.67%   96.56%   -0.11%     
==========================================
  Files          24       24              
  Lines        2375     2416      +41     
==========================================
+ Hits         2296     2333      +37     
- Misses         79       83       +4     

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