Add S3 filter example

[charliejllewellyn]

It would be useful to have an example of a filter

Issue #, if available:

Description of changes:

Description of how you validated changes:

Checklist:

• Write/update tests
• make pr passes
• Update documentation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #909 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #909   +/-   ##
========================================
  Coverage    94.65%   94.65%           
========================================
  Files           69       69           
  Lines         3011     3011           
  Branches       559      559           
========================================
  Hits          2850     2850           
  Misses          85       85           
  Partials        76       76

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9385a0a...cc48fbc. Read the comment docs.