func (cli *Client) NetworksPrune(ctx context.Context, pruneFilters filters.Args) (types.NetworksPruneReport, error) {
	var report types.NetworksPruneReport
	if err := cli.NewVersionError("1.25", "network prune"); err != nil {
		return report, err
	}
	query, err := getFiltersQuery(pruneFilters)
	if err != nil {
		return report, err
	}
	serverResp, err := cli.post(ctx, "/networks/prune", query, nil, nil)
	defer ensureReaderClosed(serverResp)
	if err != nil {
		return report, err
	}
	if err := json.NewDecoder(serverResp.body).Decode(&report); err != nil {
		return report, fmt.Errorf("Error retrieving network prune report: %v", err)
	}
	return report, nil
}
NetworksPrune requests the daemon to delete unused networks
package client  
import (
	"context"
	"encoding/json"
	"fmt"
	"github.com/docker/docker/api/types"
	"github.com/docker/docker/api/types/filters"
)