Getting the root directory of a file in Google Drive using API - api

Question

I need to get the full path of folders where a file is located in Google Drive. I'm getting the files themselves using the Google Drive API, but I need information about it's parent folders
I'm using the following code tothe the list of spreadsheets in a Shared Drive:
from googleapiclient import discovery
from httplib2 import Http
from oauth2client import file, client, tools
# Change the value of SCOPES to 'https://www.googleapis.com/auth/drive'
# if you want to be able to read and write to the user's Google Drive.
SCOPES = 'https://www.googleapis.com/auth/drive'
store = file.Storage('storage.json')
creds = store.get()
if not creds or creds.invalid:
flow = client.flow_from_clientsecrets('client_secret.json', SCOPES)
creds = tools.run_flow(flow, store)
DRIVE = discovery.build('drive', 'v3', http=creds.authorize(Http()))
folder_id = "1Z1GzY-D3I3qwQu3oxIW-L1a9nXgD0PXl"
query = "mimeType='application/vnd.google-apps.spreadsheet'"
query+= "and fullText contains 'CLAS' and trashed = false"
# query += " and parents in '" + folder_id + "'"
spreadsheets = []
# Initialize the page token
next_page_token = None
# Loop until all pages of results have been retrieved
while True:
# Execute the list request
response = DRIVE.files().list(
q=query,
corpora='drive',
includeItemsFromAllDrives=True,
driveId='0AEJNMySKcEzsUk9PVA',
supportsAllDrives=True,
# orderBy='folder',
pageSize=1000,
fields='nextPageToken, files(id, name, parents, mimeType, webViewLink)',
pageToken=next_page_token,
).execute()
# Append the results to the list
spreadsheets.extend(response.get('files', []))
# Check if there is another page of results
next_page_token = response.get('nextPageToken', None)
if next_page_token is None:
break
# Set the page token for the next iteration
# parameters['pageToken'] = next_page_token
# Print the number of results
print(f'Last spreadsheet found: {spreadsheets[-1]["name"]}. Number of spreadsheets: {len(spreadsheets)}')
This returns a list of dictionaries with the specified fields. I would like to know the names of the parent folders for each file, for which I'm trying:
from googleapiclient.errors import HttpError
for item in spreadsheets:
if 'parents' in item:
parent_folders_list = []
parent_id = item['parents'][0]
try:
while parent_id:
folder=DRIVE.files().get(fileId=parent_id, fields='name, id, parents').execute()
parent_folders_list.append(folder.get("parents", []))
if parent_id:
parent_id = parent_id[0]
except HttpError as error:
print('An error occurred: %s' % error)
print(f'{item["name"]} is in {parent_folders_list}')
And I've been able to identify that parent_id is correctly retrieved, and that I am able to access it, as I was able to open it in the browser. However, I get back errors 'File Not Found' for all parent_id. I wonder if the DRIVE.files().get(fileId=) is the correct way to get back a folder using the API.
Any help would be greatly appreciated.