func ProcRoot(path string) func(controller *blkioController) {
	return func(c *blkioController) {
		c.procRoot = path
	}
}
ProcRoot overrides the default location of the "/proc" filesystem
package cgroups
import (
	"bufio"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	v1 "github.com/containerd/cgroups/stats/v1"
	specs "github.com/opencontainers/runtime-spec/specs-go"
)
func NewBlkio(root string, options ...func(controller *blkioController)) *blkioController {
	ctrl := &blkioController{
		root:     filepath.Join(root, string(Blkio)),
		procRoot: "/proc",
	}
	for _, opt := range options {
		opt(ctrl)
	}
	return ctrl
}