Is the paramiko's API threading safe?

[bsxfun]

I want to download files using paramiko with multithreading.
But I am not sure if the paramiko's API is threading safe.
If the API is threading safe, then I can write codes as following: (python 3.6)

from paramiko import SSHClient, AutoAddPolicy
from concurrent.futures import ThreadPoolExecutor
from typing import List

def dowload(files: List[str]) -> None:
    client = SSHClient()
    client.set_missing_host_key_policy(AutoAddPolicy()) 
    client.connect(username=.., ..)
    sftp = client.open_sftp()
    with ThreadPoolExecutor(10) as pool:
        pool.map(lambda fn: sftp.get(fn, fn), files)

Is the code right? And if there any document mentioned about the threading safe?