Get data usage information

Example response

{
  "Containers": [
    {
      "Command": "top",
      "Created": 1472592424,
      "HostConfig": {
        "NetworkMode": "default"
      },
      "Id": "e575172ed11dc01bfce087fb27bee502db149e1a0fad7c296ad300bbff178148",
      "Image": "busybox",
      "ImageID": "sha256:2b8fd9751c4c0f5dd266fcae00707e67a2545ef34f9a29354585f93dac906749",
      "Labels": {},
      "Mounts": [],
      "Names": [
        "/top"
      ],
      "NetworkSettings": {
        "Networks": {
          "bridge": {
            "Aliases": null,
            "EndpointID": "8ed5115aeaad9abb174f68dcf135b49f11daf597678315231a32ca28441dec6a",
            "Gateway": "172.18.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAMConfig": null,
            "IPAddress": "172.18.0.2",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "Links": null,
            "MacAddress": "02:42:ac:12:00:02",
            "NetworkID": "d687bc59335f0e5c9ee8193e5612e8aee000c8c62ea170cfb99c098f95899d92"
          }
        }
      },
      "Ports": [],
      "SizeRootFs": 1092588,
      "State": "exited",
      "Status": "Exited (0) 56 minutes ago"
    }
  ],
  "Images": [
    {
      "Containers": 1,
      "Created": 1466724217,
      "Id": "sha256:2b8fd9751c4c0f5dd266fcae00707e67a2545ef34f9a29354585f93dac906749",
      "Labels": {},
      "ParentId": "",
      "RepoDigests": [
        "busybox@sha256:a59906e33509d14c036c8678d687bd4eec81ed7c4b8ce907b888c607f6a1e0e6"
      ],
      "RepoTags": [
        "busybox:latest"
      ],
      "SharedSize": 0,
      "Size": 1092588,
      "VirtualSize": 1092588
    }
  ],
  "LayersSize": 1092588,
  "Volumes": [
    {
      "Driver": "local",
      "Labels": null,
      "Mountpoint": "/var/lib/docker/volumes/my-volume/_data",
      "Name": "my-volume",
      "Options": null,
      "Scope": "local",
      "UsageData": {
        "RefCount": 2,
        "Size": 10920104
      }
    }
  ]
}