Microsoft Graph API for drive Item permissions

Hello,

I am using Microsoft Graph API v1.

The setup of my app application:

1. My users are assigned to Groups that have different permissions(owner and restricted read).
2. The Groups are assigned to the site.
3. I need to check the permissions of a particular user to a particular drive item(file) via Microsoft Graph API.

I am using the following option for the permissions:

groups/${groupId}/drive/items/${documentId}?$select=id&$expand=permissions

I get the following result for uses in the "Member" group with restricted read access:

{
  "@odata.context": "@odata.context",
  "@odata.etag": "@odata.etag",
  "id": "id",
  "permissions@odata.navigationLink": "drive/items/id/permissions",
  "permissions": [
    {
      "grantedTo": {
        "user": {
          "displayName": "Owner"
        }
      },
      "id": "id",
      "roles": []
    },
    {
      "grantedTo": {
        "user": {
          "email": "",
          "id": "",
          "displayName": "Member"
        }
      },
      "id": "id",
      "roles": []
    }
  ]
}

When I change the permission of the "Member" group to "read" access, I get the following result:

{
  "@odata.context": "@odata.context",
  "@odata.etag": "@odata.etag",
  "id": "id",
  "permissions@odata.navigationLink": "drive/items/id/permissions",
  "permissions": [
    {
      "grantedTo": {
        "user": {
          "displayName": "Owner"
        }
      },
      "id": "id",
      "roles": []
    },
    {
      "grantedTo": {
        "user": {
          "email": "",
          "id": "",
          "displayName": "Member"
        }
      },
      "id": "id",
      "roles": []
    }
  ]
}

When I change the permission of the "Member" group to "edit" access, I get the following result:

{
  "@odata.context": "@odata.context",
  "@odata.etag": "@odata.etag",
  "id": "id",
  "permissions@odata.navigationLink": "drive/items/id/permissions",
  "permissions": [
    {
      "grantedTo": {
        "user": {
          "displayName": "Owner"
        }
      },
      "id": "id",
      "roles": ["owner"]
    },
    {
      "grantedTo": {
        "user": {
          "email": "",
          "id": "",
          "displayName": "Member"
        }
      },
      "id": "id",
      "roles": ["write"]
    }
  ]
}

I have also tried this endpoint:

groups/${groupId}/drive/items/${documentId}/permissions

It shows the same results: "owner"/"write" roles when a user has a "write" role and an empty string when a user has a read or restricted role.

Could you please advise me on how to get detailed information on what permission the user has?