def parse_path(s3_datapath):
    """
    Return bucket and prefix from full s3 path.
    
    Parameters
    ----------
    s3_datapath : str
        path to a bucket. 
        Should be of the form s3://bucket/prefix/.
    
    Returns
    -------
    tuple
        bucket and prefix.
    """
    bucket_path = str(s3_datapath).split('//')[1]
    parts = bucket_path.split('/')
    bucket = parts[0].strip('/')
    prefix = '/'.join(parts[1:])
    return bucket, prefix
