Changes to FAT back-end (#580)

[joachimmetz]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.82%. Comparing base (8099393) to head (d92e248).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dfvfs/vfs/fat_file_system.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #790      +/-   ##
==========================================
- Coverage   87.85%   87.82%   -0.04%     
==========================================
  Files         297      297              
  Lines       12288    12287       -1     
==========================================
- Hits        10796    10791       -5     
- Misses       1492     1496       +4     

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