// Provide the file name
function getFullFolderPath(fileName) {
  // Search for the file with that name and process the first result
  var files = DriveApp.getFilesByName(fileName);

  if (files.hasNext()) {
    var file = files.next(),
      folders = [],
      parent = file.getParents();

    if (parent) {
      // Display the URL of the containing folder
      Logger.log('Folder URL: ' + parent.getUrl());
    }

    while (parent.hasNext()) {
      parent = parent.next();

      folders.push(parent.getName());

      parent = parent.getParents();
    }

    if (folders.length) {
      // Display the full folder path
      Logger.log('Folder path: ' + folders.reverse().join('/'));
    }
  }
}