```
The chunker option, '-s', specifies the chunking strategy that dictates
  how to break files into blocks. Blocks with same content can
  be deduplicated. The default is a fixed block size of
  256 * 1024 bytes, 'size-262144'. Alternatively, you can use the
  rabin chunker for content defined chunking by specifying
  rabin-[min]-[avg]-[max] (where min/avg/max refer to the resulting
  chunk sizes).
```