Что означает три точки при установке всяких пакетов в Golang?

$ go list net
net

$ go list net/...
net
net/http
net/http/cgi
net/http/cookiejar
net/http/fcgi
net/http/httptest
net/http/httptrace
net/http/httputil
net/http/internal
net/http/pprof
net/internal/socktest
net/mail
net/rpc
net/rpc/jsonrpc
net/smtp
net/textproto
net/url