Some parts of the response from "docker inspect" shouldn't be transformed via kebab-case-keyword

[mforsyth]

For example, Volumes is returned as a map. The key of each entry represents the path on the host, and the value represents the path on the container. Since the keys in this case are filesystem paths, they're not suitable for conversion to symbols and should be left as strings.

For example, "/mnt/s3" gets transformed to :/mnt/s-3

There may be other parts of the nested data structure that would benefit from being left as strings as well...