FileStorageContainer.Manage.All

const options = {
	authProvider,
};

const client = Client.init(options);

const permission = {
  roles: ['reader'],
  grantedToV2: {
    user: {
      userPrincipalName: '[email protected]'
    }
  }
};

await client.api('/storage/fileStorage/containers/b!ISJs1WRro0y0EWgkUYcktDa0mE8zSlFEqFzqRn70Zwp1CEtDEBZgQICPkRbil_5Z/permissions')
	.post(permission);

Connect-MgGraph -Scopes "FileStorageContainer.Manage.All"
Invoke-MgGraphRequest -Method GET -Uri "https://graph.microsoft.com/v1.0/storage/fileStorage/containers?$filter=containerTypeId eq {id}"

# Code snippets are only available for the latest version. Current version is 1.x
from msgraph import GraphServiceClient
from msgraph.generated.models.permission import Permission
from msgraph.generated.models.share_point_identity_set import SharePointIdentitySet
from msgraph.generated.models.identity import Identity
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = Permission(
	roles = [
		"reader",
	],
	granted_to_v2 = SharePointIdentitySet(
		user = Identity(
			additional_data = {
					"user_principal_name" : "[email protected]",
			}
		),
	),
)

result = await graph_client.storage.file_storage.containers.by_file_storage_container_id('fileStorageContainer-id').permissions.post(request_body)