Support all-squash mount option

[kyungwan-nam]

refer to #5394

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.44%. Comparing base (654b316) to head (73b7c1e).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5395       +/-   ##
===========================================
- Coverage   50.62%   21.44%   -29.18%     
===========================================
  Files         166       29      -137     
  Lines       47542    18922    -28620     
===========================================
- Hits        24068     4058    -20010     
+ Misses      20777    14378     -6399     
+ Partials     2697      486     -2211     

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