Add filter

[johnfercher]

Description

• Add filter

Related Issue

Checklist

check with "x", if applied to your change

• All methods associated with structs has func (<first character of struct name> *struct) method() {} name style.
• Wrote unit tests for new/changed features.
• Updated docs/doc.go
• Updated pkg/example_test.go
• Updated README.md
• New public methods/structs/interfaces has comments upside them explaining they responsibilities
• Executed make dod with none issues pointed out by golangci-lint and goreportcard-cli

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6af6d45) 100.00% compared to head (85954c5) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #16   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           85       107   +22     
=========================================
+ Hits            85       107   +22     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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