service/containers: correctly plumb fieldpaths
service/containers: correctly plumb fieldpaths

Signed-off-by: Stephen J Day <63efd86fa22882ae89b6027b22a36e4db1f4214d@docker.com>

mikebrow/containerd,thaJeztah/containerd,dmcgowan/containerd,mikebrow/containerd,containerd/containerd,vdemeester/containerd,vdemeester/containerd,thaJeztah/containerd,estesp/containerd,containerd/containerd,kunalkushwaha/containerd,crosbymichael/containerd,miaoyq/containerd,dmcgowan/containerd,crosbymichael/containerd,AkihiroSuda/containerd,miaoyq/containerd,kunalkushwaha/containerd,estesp/containerd