A great tool for visualizing the dependencies between Go packages is godepgraph. This can output the dependency graph for packages in a Go package in GraphViz format. This can be viewed easily using XDot or saved into various image formats.
$ go get github.com/kisielk/godepgraph
$ godepgraph github.com/joe/foogoproject > out.dot
Tried with: Go 1.6.2 and Ubuntu 14.04