Fix `docker system df` when LCOW and WCOW images loaded
Fix `docker system df` when LCOW and WCOW images loaded

Signed-off-by: John Howard <50ae662f5fcde39b7d1ed786133b7c61a25411dd@microsoft.com>

jwhonce/docker,x1022as/docker,dmcgowan/docker,paralin/docker,cpuguy83/docker,kolyshkin/docker,x1022as/docker,Ramzec/docker,dims/docker,maxamillion/docker,kojiromike/docker,yongtang/docker,rancher/docker,gnailuy/docker,AkihiroSuda/docker,ibuildthecloud/docker,docker/docker,laijs/docker,jthelin/docker,cpuguy83/docker,jimjag/docker,trebonian/docker,konstruktoid/docker-upstream,moby/moby,flavio/docker,nalind/docker,flavio/docker,rremer/moby,paralin/docker,jameszhan/docker,YuPengZTE/docker,jlhawn/docker,jimjag/docker,pradipd/moby,bearstech/moby,KarthikNayak/docker,moul/docker,KarthikNayak/docker,trebonian/docker,nawawi/docker,kolyshkin/moby,mikebrow/docker,ibuildthecloud/docker,mahak/docker,justincormack/docker,YuPengZTE/docker,rancher/docker,nalind/docker,bearstech/moby,dims/docker,laijs/moby,Mokolea/docker,paralin/docker,x1022as/docker,docker/docker,mikebrow/docker,gnailuy/docker,konstruktoid/docker-1,moby/moby,thaJeztah/docker,vdemeester/docker,Ramzec/docker,konstruktoid/docker-upstream,justincormack/docker,crosbymichael/docker,konstruktoid/docker-upstream,yosifkit/docker,djs55/docker,crosbymichael/docker,dmcgowan/docker,yongtang/docker,maxamillion/docker,laijs/docker,estesp/docker,unclejack/docker,yosifkit/docker,mahak/docker,kolyshkin/moby,mahak/docker,jimjag/docker,kolyshkin/moby,paralin/docker,vdemeester/docker,nawawi/docker,moul/docker,moul/docker,scotttlin/docker,djs55/docker,rremer/moby,moul/docker,gnailuy/docker,trebonian/docker,nalind/docker,dmcgowan/docker,SvenDowideit/docker,laijs/moby,kolyshkin/docker,thaJeztah/docker,bearstech/moby,flavio/docker,Mokolea/docker,jameszhan/docker,YuPengZTE/docker,moby/moby,nawawi/docker,rancher/docker,yongtang/docker,estesp/docker,ibuildthecloud/docker,KarthikNayak/docker,SvenDowideit/docker,thaJeztah/docker,AkihiroSuda/docker,cpuguy83/docker,konstruktoid/docker-1,cpuguy83/docker,mikebrow/docker,jwhonce/docker,AkihiroSuda/docker,scotttlin/docker,vdemeester/docker,Mokolea/docker,jimjag/docker,flavio/docker,jlhawn/docker,crosbymichael/docker,unclejack/docker,trebonian/docker,ibuildthecloud/docker,jlhawn/docker,maxamillion/docker,tmp6154/docker,justincormack/docker,ibuildthecloud/docker,unclejack/docker,pradipd/moby,thaJeztah/docker,laijs/docker,jameszhan/docker,kojiromike/docker,Ramzec/docker,kojiromike/docker,docker/docker,nalind/docker,rremer/moby,bearstech/moby,moby/moby,konstruktoid/docker-upstream,Ramzec/docker,tmp6154/docker,djs55/docker,mahak/docker,scotttlin/docker,estesp/docker,konstruktoid/docker-1,jvanz/docker,nawawi/docker,jthelin/docker,AkihiroSuda/docker,yosifkit/docker,laijs/moby,gnailuy/docker,jwhonce/docker,tmp6154/docker,pradipd/moby,Mokolea/docker,jvanz/docker,yosifkit/docker,SvenDowideit/docker,dims/docker,jvanz/docker