[2.x] Refactor filesystem helpers

[caendesilva]

Changes here can now be cherry picked to master as none of these are breaking, as only the implementations are refactored, but none of the APIs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (88e3c5e) to head (2872b8e).

❗ Current head 2872b8e differs from pull request most recent head d520dc0. Consider uploading reports for the commit d520dc0 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##             2.x-dev    #1698      +/-   ##
=============================================
- Coverage      99.97%   99.97%   -0.01%     
+ Complexity      1773     1769       -4     
=============================================
  Files            183      183              
  Lines           4714     4706       -8     
=============================================
- Hits            4713     4705       -8     
  Misses             1        1              

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