Package overmount - mount tars in an overlay filesystem overmount is intended to mount docker images, or work with similar functionality to achieve a series of layered filesystems which can be composed into an image. See the examples/ directory for examples of how to use the API. github.com/pkg/errors.Wrap is in use with many of our errors; look at the errors.Cause API in that package for more information on how to extract the static error constants.